A teacher asks her students to use the word ""contagious"" in a sentence... Sally raises her hand. ""Yes, Sally?"" She answers, ""I was at the doctor's office with my mom, but she told me not to play with the toys in the waiting room because the other kids were contagious."" ""Very good, Sally!"" the teacher said, ""Anyone else want to try?"" Jessie raises her hand. ""Yes, Jessie?"" She answers, ""My dad tells me not to yawn because then everybody else yawns. He said yawning is contagious."" ""E…